Ceinture (f)
(with) definite article: lastrap around the body, slipped through an eye on (or fastened to) the bellows, to keep the latter in position
Chassaing, Jean-François: La tradition de cornemuse en Basse-Auvergne et Sud-Bourbonnais [Thèse de doctorat, ethnologie 3e cycle, Univ. Lyon 2, 1981]. Moulins, 1983 (© 1982), p.12.